JPS5845928A - Plastic sheet causing diffused reflection for light - Google Patents

Abstract

PURPOSE:To manufacture a plastic sheet causing diffused reflection for light in a simple process and economically, by hardening thermally melting resin extruded from a T-die by a cooling roll with a finely rugged surface in the form of a sheet. CONSTITUTION:Thermally melting resin (such as polyolefin, etc.) inserted from a hopper 1 is heated and melted in an extruder 2 and extruded like a film from the long slit 3a of a T-die 3 to form a molten resin curtain part 4. Then, this curtain part 4 is passed between a pressure roll 6 and a cooling roll 8 having a finely rugged surface, cooled, hardened to form a sheet A causing diffused reflection for light having a finely rugged surface B. This is wound on a drum 9. In addition, the sheet A obtained is stretched by a tenter, etc. lengthwise and breadthwise to obtain a thin and firm sheet A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the invention in which diffused reflection of light is formed on one surface of a plastic film or sheet. In detail, a multi-ray diffuse reflection film layer (matte layer) is continuously formed by roughening the surface of the ninth cooling roll that cools and solidifies the hot fIs molten resin using the extra roots method. He then attempted to obtain a light diffused reflection sheet with gold 1/4 layer deposited on top of this diffused reflection film.

Conventional methods for forming a diffusely reflective film layer on one surface of a long substrate include dissolving a resin mixed with IdgI particles in a solvent, applying it using a gravure coating method, a silk screen method, etc., and drying it with heat to form a fine layer. A diffusely reflective layer was formed on the rough surface.

However, in these conventional methods, the resin solution adheres to the plate cylinder, causing clogging of the plate cylinder and screen clogging, making it impossible to obtain a uniform finely rough surface.Also, the solvent remains on the product, resulting in this problem. It has the drawback that it causes direct pollution to the surroundings during the processing of the product, the manufacturing of its secondary products, and the cost, and the major drawback is that it cannot be avoided with resins that do not dissolve in hot water. In addition, over time, the concentration of the resin dissolved in the solvent increases due to the dissipation of the solvent.
The drawback was that it was a bottleneck in the food production process.

In addition, there are other mechanical and physical methods such as sandblasting and embossing, but these methods require severe selection of film material length, neck length, and film thickness. It has the disadvantage that it must be made thicker. Furthermore, there are other chemical methods such as etching, but these have the drawbacks that the selection of film materials is difficult and cleaning and drying during processing is difficult.

Furthermore, synthetic resin films are generally weak and difficult to cut when they are torn from a desired point, as they tend to deviate in the direction of the stretch and wrinkle.

Generally, synthetic resin films are stretched to improve their physical properties, and biaxially stretched films in particular are designed to strengthen stiffness, improve transparency, improve barrier properties, and improve heat shrinkability. ) Biaxially stretched materials are even more difficult to tear than non-stretched materials; even if the edges are slightly bent, they will not tear, and even if they are torn, they are stretched in both axes. The tear direction is inconsistent. Synthetic resin films such as polyester and polyolefin, which have high mechanical and dimensional stability, cannot be cut by hand unless they are cut with a knife.

This invention was made in order to eliminate all of the various drawbacks of the conventional example, and the 10th aspect of this invention is to transfer hot molten resin by an extrusion method to a cooling roll with a finely rough surface. The object of the present invention is to provide a light ray diffused reflection plastic sheet which is formed by forming a light ray diffused reflection surface with a finely roughened surface on the surface by forming a 41I mold into a sheet shape.

A second feature of the present invention is to provide a light ray-diffusion-reflecting plastic sheet in which, in addition to the features of the sheet 1, the sheet is stretched in the vertical and horizontal directions using a tender mechanism or the like. There is a particular thing.

Furthermore, the third feature of the present invention is that in addition to the tuna 1t or second percent image, paper is pasted on the non-diffuse reflective surface of the light ray diffusely reflective plastic sheet to prevent tearing. An object of the present invention is to provide a plastic sheet with diffused reflection of light rays, which is characterized by the following characteristics. - Hereinafter, the present invention will be explained in detail with reference to the illustrated embodiments.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a hopper having an input port 1a for pellets of heat-melting resin such as polyolefins, polyvinyl chloride, polyester, etc.

Snow is made by heating and melting the resin pellets in an extruder, and
It is extruded and supplied to Da and I Hatake.

Then, a molten resin curtain portion 4- is extruded from the elongated slit 3a of the T-die 3 in the form of a film with a constant thickness and a constant width. A cooling roll 8 having a very fine rough surface is provided so as to be in rolling contact with the surface of the pressure roll at a predetermined pressure.

Then, the molten resin curtain portion 4 is smoothly placed between the pressure roll 60 and the cooling roll 6, so that the molten resin surface becomes the finely rough surface of the cooling roll. Accordingly, it is cooled and solidified to obtain a diffused reflection sheet A1 having a finely roughened surface Bt, that is, a sheet product 9 according to the present invention.

This sheet product 9 has fine irregularities that cause the incident light to reflect beautifully and diffusely with a white shining feeling, making it possible to obtain the finely-grained light diffused reflection packaging decorative paper of the present single woman, which has never been seen before.

As an example of the second percent image according to the present invention, the sheet A having the finely roughened surface B was pre-tendered by a well-known means such as wood (by a method such as wood), so that it could be stretched by Km in the vertical and horizontal directions. - A plastic sheet with strong field line diffuse reflection can be obtained.

Furthermore, as a third embodiment of the invention, in which the diffused reflection surface eA of the light ray diffused reflection plastic sheet product 9 is applied to the diffused reflection surface eA, &
Since the laminate-grade tightening cape is attached using well-known means, a sheet with diffused reflection of light that is resistant to tearing can be obtained.

As described above, according to the first embodiment of the present invention, a hot molten resin is solidified into a sheet through a cooling roll with a finely roughened surface by the extrusion method, and one surface of the resin is solidified into a sheet. Since zero diffuse reflection of light rays is formed on the finely rough surface, no solvent is used compared to the surface solvent-dissolved resin coating method as in the conventional example, so that scratches t and b on the cooling roll occur.

In addition, according to the present invention, the cooling roll surface used in the conventional plastic sheet film forming process is simply made into a finely roughened surface and no solvent is used, so there is no wastage of resources due to solvent dissipation and no organic pollution to the surrounding area. . Moreover, in this invention, it is possible to firmly form a light-diffusion-reflecting rough surface made of heat-melted resin, so even resins that do not dissolve in solvents can be agglomerated, and there is no need to manage the viscosity of the molten resin using a microcomputer, etc. It has a new and useful effect industrially in that it can automate the temperature and rotation speed of the cooling roll and the cooling roll under optimal conditions, allowing uniform products to be produced in large quantities at low cost. Furthermore, compared to mechanical methods such as sandblasting and embossing, the present invention has a greater degree of freedom in selecting the material and thickness of the film, resulting in a large economical effect by using an inexpensive film.

Furthermore, compared to chemical methods such as etching, it does not require energy, water, chemicals, etc. for cleaning, drying, etc., making it economical, energy saving, and resource saving. .

In addition to this, the second percent mold of this invention is ll! According to the koji example, the above-mentioned sea)? Since it is abraded in one vertical and horizontal direction using a tender mechanism, in addition to the above effects, the synthetic resin film has improved physical properties, strengthened the stiffness of the sheet as a whole, improved transparency, improved barrier properties, improved heat shrinkability, etc. measured,
A slight tz*ao cut will not tear it, and even if it does tear, the direction of the nine-way tear extending from both shafts will not add up, and it will be impossible to cut it by hand unless it is cut with a knife. have an effect.

Furthermore, according to a third characteristic embodiment of the present invention, in addition to the second characteristic, the first trench has a paper attached to the non-diffuse reflective surface of the light-reflecting plastic sheet. (The sheet as a whole is strong) When tearing from a desired point, the sheet can be easily torn in the desired direction from the desired point. It's a turtle.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention; FIG. 1 is a block diagram showing an embodiment of the invention, and FIG. 2 is an enlarged sectional view showing an example of a product according to the invention. A...Top-tight reflective sheet, B...li! ! Surface fine rough surface, D... Backing paper, 1... Hopper, = 1 hma pellet input port, 8... Extruder, l-T die, 1 m.
- Nulit, 4... Molten resin curtain portion, #-... Pressure roll, 7... Tick-up drum,... Cooling roll,... Sheet product. Figure 2

Claims (1)

[Claims] ° (1) By solidifying the hot molten resin into a sheet form through a cooling roll with a finely roughened surface using the extrusion method, a light scattering reflection surface with a finely roughened surface is formed on the surface. (2) A light-diffusing reflective plastic sheet according to the asst item of the above claim, characterized in that the sheet is stretched in the longitudinal and lateral directions with a uniform tender structure. A plastic sheet with diffused reflection of light. (5) In the item described in claim 2, the above-mentioned claim 1 is extended by the fact that paper is pasted on the non-diffuse reflection surface of the front light distribution/diffuse reflection plastic sheet. # A glass sheet with diffused reflection of light that can be used as an image.